1.Acute and Chronic Cervicitis - At the onset of menarche, the production of estrogens by the ovary stimulates maturation of the cervical and vaginal

Transcription

1 Diseases of cervix

2 I. Inflammations

3 1.Acute and Chronic Cervicitis - At the onset of menarche, the production of estrogens by the ovary stimulates maturation of the cervical and vaginal squamous mucosa and formation of intracellular glycogen vacuoles in the squamous cells.

4 Chronic cervivitis

5 - As these cells are shed, the glycogen provides a substrate for various endogenous vaginal, particularly lactobacilli, which are the dominant microbial species in the normal vagina. - Lactobacilli produce lactic acid, which maintains the vaginal ph below 4.5,and this leads to

6 Suppression of growth of other organisms. Because at low ph, lactobacilli produce bacteriotoxic hydrogen peroxide (H 2 O 2 ). - If the ph becomes alkaline due to a. bleeding,,, H 2 O 2 production by lactobacilli decreases. b. Antibiotic therapy that suppress lactobacilli can also cause the ph to rise.

7 - In each of these settings the altered vaginal environment promotes the overgrowth of other microorganisms, which may result in cervicitis

8 II. Endocervical polyps - Are common benign exophytic growths - Their main significance is that they may be the source of irregular vaginal or bleeding that arouses suspicion of some more ominous lesion. - Surgical excision is curative. - Endocervical polyp composed of a dense fibrous stroma covered with endocervical columnar epithelium.

9 Endocervical polyp

10 III. Premalignant and Malignant Neoplasms of the Cervix - Worldwide, cervical carcinoma is the third most common cancer in women, - Fifty years ago, carcinoma of the cervix was the leading cause of cancer deaths in women in the United States, but the death rate has declined by two thirds to its present rank as the thirteenth cause of cancer mortality.

11 A. Cervical Intraepithelial Neoplasia (Squamous Intraepithelial Lesions) - Terminology:Previously - Cervical intraepithelial neoplasia (CIN) classification i. Mild dysplasia termed CIN I, ii. Moderate dysplasia CIN II, iii. Severe dysplasia termed CIN III.

12 Recently - The three-tier classification system has been simplified to a two-tiered system, with 1. CIN I And II renamed low-grade squamous intraepithelial lesion (LSIL) 2. and CIN III combined into one category referred to as high-grade squamous intraepithelial lesion (HSIL).

13 I. LSIL a. LSILs are ten times more common than HSILs b. LSIL does not progress directly to invasive carcinoma c. And in fact most cases regress spontaneously;and only a small percentage progress to HSIL. d. LSIL is not treated like a premalignant lesion.

14 II. HSIL 1. There is a progressive deregulation of the cell cycle by HPV, which results in Increased cellular proliferation, 2. Derangement of the cell cycle in HSIL may become irreversible and lead to a fully transformed malignant phenotype, 3. Therfore all HSILS are considered to be at high risk for progression to carcinoma.

15 Morphology - More than 80% of LSILs and 100% of HSILs are associated with high-risk HPVs, with HPV-16 being the most common - The diagnosis of SIL is based on identification of nuclear atypia characterized by nuclear enlargement, hyperchromasia coarse chromatin s, and variation in nuclear size and shape

16 - Associated with koilocytic atypia. - At an ultrastructural level, these halos consist of HPV-encoded protein called E5 that localizes to the membranes of the endoplasmic reticulum. - It is important to grade SIL histologically into LSIL and HSIL

17 - Progression to invasive carcinoma, when it occurs, takes place over a period of a few years to more than a decade

18 IV.Cervical Carcinoma - The average age of patients with invasive cervical carcinoma is 45 years. Types 1. 80% are squamous cell carcinomas % are Adenocarcinomas 3. 5% are adenosquamous and neuroendocrine carcinomas Note: All of the these types are caused by highrisk HPVs

19 NOTE - The progression time from in situ to invasive adenosquamous is shorter than in squamous cell carcinoma, - and patients with this type of tumors often present with advanced disease and have a less favorable prognosis.

20 Morphology 1. Squamous cell carcinoma - Is composed of nests and tongues of malignant squamous epithelium, either keratinizing or nonkeratinizing, 2.Adenocarcinoma - Is characterized by proliferation of malignant endocervical cells with large, hyperchromatic nuclei and relatively mucin-depleted

21 3. Adenosquamous carcinoma - Is composed of intermixed malignant glandular and squamous epithelium. Note: - Advanced cervical carcinoma spreads by direct extension to contiguous tissues, including urinary bladder, ureters rectum, and vagina. - Lymphvascular invasion results in local and distant lymph nodes metastases

22 - Distant metastases may also be found in the liver, lungs, bone marrow, and other organs. Cervical cancer is staged as follows: Stage 0 Carcinoma in situ (CIN III, HSIL) Stage I Carcinoma confined to the cervix Stage II Carcinoma extends beyond the cervix but not to the pelvic wall or carcinoma that involves the vagina but not the lower third

23 Stage III:Carcinoma has extended to the pelvic wall.and the tumor involves the lower third of the vagina Stage IV: a. Carcinoma has extended beyond the true pelvis b. or has involved the mucosa of the bladder or rectum. c. Cancers with metastatic dissemination.

24

25 Cervical cancer stage 1

26 Cervical cancer extending to vagina

27 Clinically - More than half of invasive cervical cancers are detected in women who did not participate in regular screening.(cervical smear) - Early invasive cancers of the cervix (microinvasive carcinomas) may be treated by cervical cone excision alone,

28 - With current treatments the 5-year survival rate is 100% for microinvasive carcinomas and less than 50% for tumors extending beyond pelvis. - Most patients with advanced cervical cancer die of the consequences of local tumor invasion (e.g., ureteral obstruction, pyelonephritis, and uremia) rather than distant metastases.

29 Cervical Cancer Screening and Prevention - Cytologic cancer screening has significantly reduced mortality from cervical cancer.. - The reason that cytologic screening is so effective in preventing cervical cancer is that most cancers arise from precursor lesions over the course of years.

30 1. Cervical smear - SIL shed abnormal cells that can be detected on cytologic examination. - Called cervical smear and atained with Papanicolaou stain so it is known as pap smear

31 2. Testing for the presence of HPV DNA in the cervical scrape is a molecular method of cervical cancer screening. HPV testing has a higher sensitivity but lower specificity, as compared to Pap test.

32 Normal cervical smear

33 Cervical smear- LSIL

34 Cervical smear-hsil

35 NOTE: - HPV DNA testing may be added to cervical cytology for screening in women aged 30 years or older. - HPV testing of women younger than 30 is not recommended because of the high incidence of infection, and thus the particularly low specificity of HPV test results in this age group.

36 - After age 30, women who have had normal cytology results and are negative for HPV may be screened every 5 years. - Women with a normal cytology result, but test positive for high-risk HPV DNA, should have cervical cytology repeated every 6 to 12 months.

37 - When the result of a Pap test is abnormal, a colposcopic examination of the cervix and vagina is performed to identify the lesion. - The mucosa is examined with a magnifying glass following application of acetic acid, which highlights abnormal epithelium as white spots (aceto-white areas). - Abnormal appearing areas are biopsied.

38 1. Women with biopsy confirmed LSIL a. can be followed in a conservative fashion. Or b. Some gynecologists will perform local ablation (e.g., cryotherapy) of LSIL, 2.. HSILs are treated with cervical conization (superficial excision).

39 HPV vaccine - A new aspect of cervical cancer prevention is vaccination against high-risk oncogenic HPVs, which is now recommended for a. all girls and boys by age 11 to to 12 years, b. as well as young men and women up to age 26 years

40 - Two HPV vaccines are now FDA-licensed a.. Both provide nearly complete protection against high-risk oncogenic HPV types 16 and 18 (together accounting for approximately 70% of cervical cancers), b. and one also provides protection against HPV types 6 and 11, which are responsible for genital warts.

41 Note: - Vaccination is now recommended for boys as well as girls due to 1. the role of that males play in the spread of HPV to women 2. and the toll that HPV-related anal and oropharyngeal cancers take in men. - The vaccines offer protection for up to 10 years;